Study the variation in the atomic radii of  first group elements given below: 


(i) Arrange the elements in the increasing order of their atomic numbers. 
(ii) Name the elements which have the smallest and largest number of atoms. 
(iii) How does the metallic nature vary as one goes down a group? 
(iv) How many valence electrons are there in each element? 
(v) Write the reaction of sodium with water. 

Dear student,



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